No, you are wrong. Revenues have hovered around 18% of GDP for ages and under a variety of tax regimes. We can adjust taxation in the interest of fairness, but it will never solve the debt problem. That requires seriously addressing spending.
"Economists have warned that if lawmakers do not vote to raise the limit in the coming months, the US government risks defaulting on its debts for the first time in American history".
Read ... if the US does not agree to take on more debt it risks defaulting on its debts.